Make PR Contribution check more canonical

[jvedsaqib]

The current PR validation checks require specific phrases like
"Issue Reference:" and "Description of changes:",
which makes the contribution process rigid. To make it more flexible, the check should allow for more general wording, as long as the issue reference and change description are clearly provided.

@rohitinu6 Please assign someone to fix this.

Feel free to ask me.

[github-actions]

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